Connector: refresh token if needed before metadata exchange.

[xjuan]

Fix issue #346 "Invalid token in metadata exchange"

[google-cla]

Thanks for your pull request! It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

View this failed invocation of the CLA check for more information.

For the most up to date status, view the checks section at the bottom of the pull request.

[enocom]

Thanks for the PR @xjuan. Before we can look at this, we need you to sign the CLA.

See here for details: https://github.com/GoogleCloudPlatform/alloydb-python-connector/pull/347/checks?check_run_id=27567309191

[xjuan]

Hi the CLA was submitted my the CTO, not sure if it should refresh automatically or not

[enocom]

If look at https://github.com/GoogleCloudPlatform/alloydb-python-connector/pull/347/checks?check_run_id=27633672198, it will let you re-run the scan. I think right now the commit has a personal and a company email which is causing it to still fail.

[enocom]

We'd like to get this bug fixed and in a release ASAP. Thanks again for the issue @xjuan!

[enocom]

Replaced by #351.

[xjuan]

hi, sorry I was in a conference, thanks for taking care of this.

[enocom]

No problem. Thanks for the issue. On further digging we found the root cause (this was just a symptom): #357.

[enocom]

That's also been fixed in the latest release.